Portable water filter



FIG. 1 is an isometric view of a portable water filter showing my new design, with the broken lines shown for illustrative purposes only and forming no part of my claimed design;

FIG. 2 is an isometric view showing the top thereof;

FIG. 3 is an isometric view showing the bottom thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a portable water filter, as shown and described. 